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Having trouble building circuit?

Discussion in 'Electronics Homework Help' started by David Lastname, May 14, 2018.

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  1. David Lastname

    David Lastname

    2
    0
    May 14, 2018
    Hello, I'm building a circuit(the circuit diagram is attached) and I'm having trouble replicating it in real life. A picture of my current circuit is also attached. Can anyone give me any tips on what I can troubleshoot?

    Thanks!
     

    Attached Files:

  2. AnalogKid

    AnalogKid

    2,520
    718
    Jun 10, 2015
    No.

    Is the circuit running too fast? Too slow? Did it burst into flames? Think about it - do you really believe that "I'm having trouble" is actual information?

    However, the construction does need help.

    Add a ceramic decoupling capacitor across the power and ground pins of each chip. Keep the leads as short as possible and connect as close as possible. Value can be anything from 0.1 uF to 1.0 uF.

    Add an electrolytic capacitor across the two power buses, anything from 10 uF and 100 uF.

    Reduce the length of all power and ground jumper wires.

    ak
     
    Last edited: May 14, 2018
  3. Chemelec

    Chemelec

    291
    47
    Jul 12, 2016
    Put a Switch between pin 3 of the 555 and pin 1 of the other IC.
    Makes Decision, Simpler than Lifting the wire.
     
  4. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    The LEDs are 'shorted' - think about how the holes in the breadboard are interconnected!!!!!!

    They are all connected to each other in a 'strip' and you've put the two LED wires in the same 'strip' of holes, effectively shorting them together.
     
    dave9 and 73's de Edd like this.
  5. KJ6EAD

    KJ6EAD

    1,114
    159
    Aug 13, 2011
    Turn the ICs right side up on the breadboard (pin 1 on the left). I can't look at it now.
     
  6. Audioguru

    Audioguru

    3,394
    733
    Sep 24, 2016
    Making an electronic circuit on a solderless breadboard is a tangled mess of wires all over the place.
     
  7. AnalogKid

    AnalogKid

    2,520
    718
    Jun 10, 2015
    Disagree. Sloppy construction is a choice.

    ak
     
  8. Audioguru

    Audioguru

    3,394
    733
    Sep 24, 2016
    The sloppy wiring mess caused the circuit not to work properly.
     
  9. David Lastname

    David Lastname

    2
    0
    May 14, 2018
    Sorry for my lack of information. I have another working circuit to compare to, and it seems that there should be voltage on both sides of the capacitors, when there isn't. Any idea why that might be the case? I flipped them around and replaced them already.
     
  10. AnalogKid

    AnalogKid

    2,520
    718
    Jun 10, 2015
    If there are no voltages on either of the 555 capacitors, then the 555 has no power applied to it. Pin 5 should read a constant 1.67 V. The other end of each capacitor is connected to GND, so there will no voltage reading there.

    ak
     
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